It's no secret that you can get great deals booking your travel in the off-peak travel seasons. So what's considered off-peak? According to American Express' Get Currency blog, that's between October 1 and December 15 or April 15 to June 1. That seems a broad stroke to us, and it's definitely not the case over Thanksgiving in the U.S. It's also worth keeping in mind that "off-season" also varies greatly by destination. Our frequent flier's guide to finding cheap airfare offers a more detailed look into planning travel on-the-cheap, and if you're really flexible on location and date, we'd highly recommend giving Kayak Explore a spin.